Which number is rational?

 √36/16

Step-by-step explanation:

√36/16

0.375

Is a rational number

√36/16

Step-by-step explanation:

Because both 36 and 16 are square roots, the square root of that fraction is 3/2, which is rational.

(n^3 - n)

= n(n-1)(n+1)

since it is divisible by 3 and 2 ,because it is a multiple 3 consecutive number

if, n-1 is odd then n+1 is also odd, then it is a multiple of 9

but if, n-1 is even then n+1 is also even, then it is a multiple of 4

so, largest multiple = max(9*2, 4*3) = max(18, 12) = 18